ἀποσταυροῦν
From LSJ
συνετῶν μὲν ἀνδρῶν, πρὶν γενέσθαι τὰ δυσχερῆ, προνοῆσαι ὅπως μὴ γένηται· ἀνδρείων δέ, γενόμενα εὖ θέσθαι → it is the part of prudent men, before difficulties arise, to provide against their arising; and of courageous men to deal with them when they have arisen
Greek > English (Woodhouse Verbs Reversed)
(see also: ἀποσταυρόω) fortify with a stockade, surround with a palisade
Lexicon Thucydideum
vallo claudere, to close off with a rampart, 4.69.2, 6.101.2, 7.80.6.